This article provides an overview of major firmware versions. Each version includes a summary of key changes, upgrade requirements, and technical details. Detailed release history is provided under each firmware version below.
BSS11
Firmware BSS11 was released to resolve premature wheel end alerts observed on devices running BSS10 in new vehicle builds.
In BSS11, the wheel end alert detection system was reverted to a more stable operating mode. As a result, several features introduced in BSS10 were removed.
Upgrade requirements
Upgrading to BSS11 requires TraX app version 3.5.4 or later.
Supported upgrade paths:
- All BSS10 releases
- All BSS08 releases
- Upgrading from BSS08c to BSS11 is supported in both Android and iOS versions of the TraX app.
- Upgrading from BSS08a or BSS08b to BSS11 is supported in the iOS app only.
Key changes
- Reverted wheel end alert detection to a more stable operating mode.
- Removed Reset Device by Magnet functionality.
- Removed Temperature Warning alert.
- Removed Vibration Monitoring status from the data frame.
The temperature advertising function with increasing broadcast frequency remains available.
Data frame compatibility
Compared to BSS10, BSS11 removes the following fields:
- Temperature Warning status
- Algorithm (vibration monitoring) status
Structurally, the BSS11 data frame matches BSS08, except for the firmware version number.
Additional details:
- The byte position previously used for Temperature Warning in BSS10 is now always set to
0. Systems displaying this field will therefore show a constant “No failure” status. - The Algorithm Status field has been replaced with debug data. This field may contain non-zero values. Based on current analysis, no TSP currently uses this field for UI display, and no operational impact is expected.
Release history
BSS11 — 2025-03-07
Changed
- Reverted the wheel end alert detection system to a more stable operating mode.
- Doubled the duration of BLE advertising bursts to improve device discoverability.
Removed
- The Reset Device Alarms by Magnet feature. Device alarms must now be reset using the TraX mobile app.
- Temperature Warning Status and Vibration Monitoring Status from the data frame.
BSS10
Firmware BSS10 introduced a new wheel end detection algorithm, temperature monitoring functionality, and additional data frame fields. This version significantly improved failure detection accuracy and expanded device capabilities.
Upgrade requirements
Supported firmware upgrade paths:
- All BSS10 releases
- All BSS08 releases
Key changes
- Introduced a new self-training algorithm to improve wheel end failure detection and reduce false positives.
- Implemented a learning phase of approximately 55 hours during which the device trains on the specific wheel end.
- Increased confidence level for wheel end failure detection to up to 95%.
- Added a Temperature Warning alarm. The measured temperature is evaluated against a predefined threshold for a specified duration. If exceeded, an alarm is triggered.
- Added Vibration Monitoring Status to indicate algorithm learning state and operational readiness.
- Added magnet-based device reset functionality.
- Increased BLE advertising duration by 100% to reduce the risk of device data packet loss.
Vibration monitoring and learning phase
Devices running BSS10 must complete a learning phase before vibration-based wheel end failure detection becomes active. After 39 measurements, the algorithm model is calculated and vibration monitoring becomes operational.
Wheel end failure detection based on vibration analysis is only available after the learning phase is complete. Other measurements, including temperature warnings, remain operational during this period.
Telematics Service Providers (TSPs) can determine the vibration monitoring status by decoding the corresponding field in the device data frame.
Data frame compatibility
BSS10 introduced new fields to the device data frame, including:
- Temperature Warning status
- Vibration Monitoring (algorithm) status
- Firmware version
These additions require TSPs to parse the BSS10 frame format when handling data from devices running this firmware version.
BSS10 Learning Phase FAQ
What is the duration of the BSS10 learning phase before wheel end failure detection becomes active?
The learning phase requires the TraX device to operate under normal vehicle conditions at a minimum speed of 40 mph (65 km/h) for approximately 55 hours. During this period, the device collects vibration data and builds the algorithm model required for wheel end failure detection.
How can you determine when the learning phase is complete?
The learning phase status is indicated in the last byte of the BLE advertising frame. This value must be decoded to determine whether the learning phase is ongoing, completed, or if inconsistent data has been detected.
Can the device be reset or reconfigured to initiate a new learning phase?
Yes. Resetting or reconfiguring the device will initiate a new learning phase. This may be necessary if the device is moved to a different wheel position or vehicle.
Is recalibration required for seasonal changes (e.g., summer to winter)?
No. Once the learning phase has been successfully completed, seasonal changes do not require recalibration or a new learning phase.
Does the device use a default model before completing the learning phase?
No. There is no predefined default failure detection model. The algorithm is built specifically for the individual wheel end during the learning phase.
Does the device operate and generate alerts during the learning phase?
Yes. The device remains fully operational during the learning phase. It continues to monitor and report other conditions such as temperature warnings and internal faults. However, vibration-based wheel end failure detection becomes active only after the learning phase is complete.
Release history
BSS10a — 2024-02-28
Changed
- Increased LED blink interval for temperature warnings from 5 seconds to 10 seconds to reduce power consumption.
Fixed
- Resolved incorrect temperature warning triggering below 0°C.
BSS10 — 2023-09-29
Changed
-
Self-Training Algorithm:
- Introduced a new TraX self-training algorithm that adapts to the current wheel end, independent of axle or vehicle type.
- Improved wheel end failure detection confidence by up to 95%.
- Increased BLE advertising interval by 100% to reduce the risk of device data packet loss.
Added
- Magnet-based device reset functionality to simplify fleet management.
- Temperature warning module. An alarm is triggered when temperature exceeds a defined threshold for a specified duration. The alarm is indicated via LED and included in the BLE advertising payload.
- New data fields in the device data frame format (see Technical Specification):
- Temperature alarm status
- Vibration monitoring status:
- 0 — Monitoring active
- 1 — Learning phase complete
- 2 — Learning phase ongoing
- 3 — Inconsistent data
- Firmware version
BSS08
Upgrade requirements
Supported firmware upgrade paths:
- All BSS08 releases
- BSS07b
Release history
BSS08d — 2022-07-26
Based on BSS08c.
Fixed
- Resolved end-of-line accelerometer self-test issue.
- Adjusted settling timing.
BSS08c — 2022-06-22
Based on BSS08b.
Fixed
- Fixed Bluetooth issue where connection was not possible on some Android devices (BLE 5.0 or higher).
- Corrected calculation of CONN_CE_INSTANT based on the connection event counter.